{
  "license": "CC BY-NC 4.0",
  "license_url": "https://creativecommons.org/licenses/by-nc/4.0/",
  "attribution": "DemandSphere Radar - Algorithm Update Tracker",
  "attribution_url": "https://www.demandsphere.com/research/demandsphere-radar/algorithm-update-tracker/",
  "terms": "Free for non-commercial use with attribution. Commercial use requires written permission from DemandSphere.",
  "contact": "https://www.demandsphere.com/contact/",
  "updated": "2026-04-19",
  "update_count": 173,
  "data_sources": [
    "Google Search Status Dashboard (live, 2021+)",
    "DemandSphere historical annotation database (2000-2020)",
    "Google Research publications (AI milestones)"
  ],
  "updates": [{"name":"March 2026 spam update","start":"2026-03-24","end":"2026-03-25","dur":"< 1 day","desc":"Targeted spam tactics including cloaking, hacked content, and auto-generated spam across the web. Rolled out over approximately two weeks with noticeable impact on thin affiliate and scraped content sites."},{"name":"March 2026 core update","start":"2026-03-27","end":"2026-04-08","dur":"12 days","incidentId":"7eTbAa2jWdToLkraZj5y","desc":"A broad core ranking update affecting how Google assesses content quality and relevance across all verticals. SEOs reported significant volatility in health, finance, and technology niches."},{"name":"February 2026 Discover update","start":"2026-02-05","end":"2026-02-26","dur":"21 days","cat":"System","incidentId":"mYbNTqV1ytDc2fA8hUz4","desc":"A ranking change specific to Google Discover feeds, altering which content surfaces in mobile Discover recommendations. Publishers reported sudden traffic shifts in Discover without changes to organic search rankings."},{"name":"December 2025 core update","start":"2025-12-11","end":"2025-12-29","dur":"18 days","incidentId":"DsirqJ1gpPRgVQeccPRv","desc":"A broad core ranking update that concluded the year with significant reshuffling of search results across multiple verticals. Rolled out over several weeks spanning into early January 2026."},{"name":"August 2025 spam update","start":"2025-08-26","end":"2025-09-21","dur":"26 days","incidentId":"a7Aainy6E9rZsmfq82xt","desc":"Targeted spammy practices including link spam, cloaking, and low-quality auto-generated content. Sites relying on scaled content abuse and manipulative link schemes saw ranking declines."},{"name":"June 2025 core update","start":"2025-06-30","end":"2025-07-17","dur":"17 days","incidentId":"riq1AuqETW46NfBCe5NT","desc":"A broad core update that continued Google's push to reward helpful, people-first content. Many sites that had lost visibility in previous helpful content updates reported partial recoveries."},{"name":"AI Mode","start":"2025-03-25","end":null,"dur":null,"cat":"System","ai":true,"desc":"Google launched AI Mode as a conversational search experience accessible from a dedicated tab in Google Search. Allows users to ask complex, multi-part questions and receive AI-generated responses with cited web sources in a chat-like interface."},{"name":"March 2025 core update","start":"2025-03-13","end":"2025-03-27","dur":"14 days","incidentId":"zpmwuSwifjDjfrVdaZUx","desc":"The first core update of 2025, bringing broad ranking changes across industries. Followed Google's integration of helpful content signals directly into core ranking systems."},{"name":"December 2024 spam update","start":"2024-12-19","end":"2024-12-26","dur":"7 days","incidentId":"UUq2WSouY7PhSm8zvtD1","desc":"Targeted link spam, cloaking, and other manipulative practices heading into the new year. Rolled out alongside the December 2024 core update, compounding volatility."},{"name":"December 2024 core update","start":"2024-12-12","end":"2024-12-18","dur":"6 days","incidentId":"V9nDKuo6nWKh2ThBALgA","desc":"A broad core ranking update that closed out a turbulent year for SEO. Ran concurrently with the December 2024 spam update, making it difficult to isolate individual effects."},{"name":"November 2024 core update","start":"2024-11-11","end":"2024-12-05","dur":"24 days","incidentId":"G7rp11wqTaTGn6JjiPF3","desc":"Released just weeks after the previous core update finished rolling out, an unusual cadence. Google stated it was a separate evaluation aimed at further improving result quality."},{"name":"August 2024 core update","start":"2024-08-15","end":"2024-09-03","dur":"19 days","incidentId":"gVx6b2o78zke7GrMidGy","desc":"A broad core update that Google said would surface more content from small and independent publishers. Some sites hit by the September 2023 helpful content update saw partial recovery."},{"name":"Deepfake ranking update","start":"2024-07-31","end":null,"dur":null,"cat":"System","desc":"Targeted non-consensual deepfake and synthetic explicit imagery in search results. Demoted sites hosting such content and prioritized removal request pages in results."},{"name":"June 2024 spam update","start":"2024-06-20","end":"2024-06-27","dur":"7 days","incidentId":"QdUeCQx3LRVbzQ3E7FiD","desc":"Addressed multiple spam tactics including scaled content abuse and expired domain abuse. Followed the enforcement timeline set by the March 2024 spam policies."},{"name":"AI Overviews","start":"2024-05-14","end":null,"dur":null,"cat":"System","ai":true,"desc":"Google rolled out AI Overviews globally at Google I/O 2024, replacing the experimental SGE with AI-generated answer summaries at the top of search results. Represented the biggest change to the Google SERP layout in years, raising significant concerns about reduced organic click-through rates."},{"name":"Site reputation abuse update","start":"2024-05-06","end":null,"dur":null,"cat":"Spam","desc":"Enforced the new site reputation abuse policy targeting third-party content hosted on reputable domains to exploit ranking signals - often called \"parasite SEO.\" Major publishers with coupon, review, or affiliate subdomains were affected."},{"name":"March 2024 spam update","start":"2024-03-05","end":"2024-03-20","dur":"15 days","incidentId":"iXz2PJfodvyjaVUeqxZE","desc":"Introduced three new spam policies - scaled content abuse, site reputation abuse, and expired domain abuse. Represented Google's most aggressive action against AI-generated spam and manipulative publishing tactics."},{"name":"March 2024 core update","start":"2024-03-05","end":"2024-04-19","dur":"45 days","incidentId":"1jW2F89qC2NxJBWGiKxE","desc":"A major core update that Google said would reduce unhelpful content in search results by 40%. Absorbed the standalone helpful content system into the core ranking algorithm and took 45 days to roll out."},{"name":"November 2023 reviews update","start":"2023-11-08","end":"2023-12-07","dur":"29 days","incidentId":"VqRTcmyQCwfpuYeaVNfn","desc":"The final standalone reviews update before the system was folded into core ranking. Expanded beyond product reviews to cover reviews of services, businesses, destinations, and media."},{"name":"November 2023 core update","start":"2023-11-02","end":"2023-11-28","dur":"26 days","incidentId":"WtY1CQgfqrr2cjxKbyUk","desc":"A broad core ranking update that rolled out over 25 days. Continued the trend of rewarding first-hand experience and expertise in content."},{"name":"October 2023 core update","start":"2023-10-05","end":"2023-10-19","dur":"14 days","incidentId":"VKyoS53ULWzSp8BoDxqk","desc":"Released while the October spam update was still rolling out, creating compounded ranking volatility. Google confirmed it was a separate core ranking evaluation."},{"name":"October 2023 spam update","start":"2023-10-04","end":"2023-10-19","dur":"16 days","incidentId":"NzcEhGMDhbQEdXCS35xL","desc":"Targeted cloaking, hacked content, auto-generated spam, and scraped content in multiple languages. Expanded spam detection capabilities to cover more languages including Turkish, Vietnamese, Indonesian, Hindi, and Chinese."},{"name":"September 2023 helpful content update","start":"2023-09-14","end":"2023-09-28","dur":"14 days","incidentId":"53diuQvcEsgzqXTPBb8p","desc":"A devastating update for many independent publishers and content sites that relied on search traffic. Introduced a new classifier that caused dramatic traffic losses for sites Google deemed unhelpful - some losing 50-80% of organic traffic overnight."},{"name":"August 2023 core update","start":"2023-08-22","end":"2023-09-07","dur":"16 days","incidentId":"nBtYtBeex4GYBbdDS2LX","desc":"A broad core update that rolled out over 16 days. SEOs observed significant movement in health, e-commerce, and content-heavy informational sites."},{"name":"SGE Launch","start":"2023-05-10","end":null,"dur":null,"cat":"System","ai":true,"desc":"Google launched Search Generative Experience (SGE) in Search Labs, providing AI-generated summaries and conversational follow-ups directly in search results. Marked Google's first major experiment with generative AI in its core search product."},{"name":"April 2023 reviews update","start":"2023-04-12","end":"2023-04-25","dur":"13 days","incidentId":"5XRfC46rorevFt8yN8iR","desc":"Expanded the reviews system to evaluate review content beyond just product reviews. Rolled out over approximately 13 days."},{"name":"March 2023 core update","start":"2023-03-15","end":"2023-03-28","dur":"13 days","incidentId":"Cou8Tr74r7EXNthuEsaG","desc":"A broad core ranking update that took about 13 days to complete. Significant volatility observed in YMYL verticals and large content aggregator sites."},{"name":"February 2023 product reviews update","start":"2023-02-21","end":"2023-03-07","dur":"14 days","incidentId":"NDjZ11MEUJb5i62hy5aN","desc":"The last update specifically named \"product reviews\" before the system was broadened. Refined how Google assessed the depth and firsthand experience demonstrated in review content."},{"name":"December 2022 link spam update","start":"2022-12-14","end":"2023-01-12","dur":"29 days","incidentId":"CxXUEK28vCKqkNocPhKR","desc":"Leveraged SpamBrain AI to neutralize unnatural links, including purchased links and large-scale link exchange schemes. Affected multiple languages and caused ranking shifts for sites relying on manipulative link-building."},{"name":"December 2022 helpful content update","start":"2022-12-05","end":"2023-01-12","dur":"38 days","incidentId":"XMdX5PmbMvKW4fv3CRvn","desc":"The first update to the helpful content system after its initial launch, now applied globally across all languages. Refined the classifier that identifies content created primarily for search engines rather than people."},{"name":"October 2022 spam update","start":"2022-10-19","end":"2022-10-21","dur":"2 days","incidentId":"SAeYuxVSo39HHotQNXHr","desc":"A global spam update targeting cloaking, hacked content, and auto-generated spam across multiple languages. Rolled out over approximately two weeks."},{"name":"September 2022 product reviews update","start":"2022-09-20","end":"2022-09-26","dur":"6 days","incidentId":"ZYwuBXDhkwaoop2V5epM","desc":"Continued to reward review content demonstrating genuine product expertise and firsthand usage. Rolled out over several weeks alongside significant core ranking volatility."},{"name":"September 2022 core update","start":"2022-09-12","end":"2022-09-26","dur":"14 days","incidentId":"Y2Cg5k2xLJvfNqR58kEt","desc":"A broad core ranking update that rolled out over two weeks. Notable for overlapping with the product reviews update, making it hard for SEOs to attribute ranking changes."},{"name":"August 2022 helpful content update","start":"2022-08-25","end":"2022-09-09","dur":"15 days","incidentId":"sbKc4YSptrSxcUZFDKwU","desc":"Introduced Google's new helpful content system with a site-wide classifier that penalizes sites with large amounts of unsatisfying or search-engine-first content. Initially English-only, it marked a major shift toward rewarding people-first content."},{"name":"July 2022 product reviews update","start":"2022-07-27","end":"2022-08-02","dur":"6 days","incidentId":"Xiid524od7fpCak86sNS","desc":"The fourth product reviews update, further refining how Google evaluates the quality and depth of review content. Continued encouraging original research, photos, and quantitative measurements in reviews."},{"name":"May 2022 core update","start":"2022-05-25","end":"2022-06-09","dur":"15 days","incidentId":"GHwLLtDS64a7nDng8xhD","desc":"A broad core update that rolled out over about two weeks. Significant volatility reported in YMYL niches, travel, and e-commerce."},{"name":"March 2022 product reviews update","start":"2022-03-23","end":"2022-04-06","dur":"14 days","incidentId":"iYWoNu4QXRsQUrzxrbLv","desc":"Expanded product review ranking signals and encouraged reviewers to demonstrate firsthand experience with products. Also began rewarding review content that included original multimedia evidence."},{"name":"Page experience update for desktop","start":"2022-02-22","end":"2022-03-03","dur":"9 days","cat":"System","incidentId":"zDCQR5mxLU3ZrQeQvwqN","desc":"Extended the page experience ranking signals - including Core Web Vitals, HTTPS, mobile-friendliness, and no intrusive interstitials - to desktop search results. The mobile version had launched in June 2021."},{"name":"December 2021 product reviews update","start":"2021-12-01","end":"2021-12-21","dur":"20 days","incidentId":"hgwP7ei5H1uKbYSeZrBZ","desc":"The second product reviews update, expanding coverage to additional languages beyond English. Continued rewarding in-depth reviews with original research and evidence of hands-on testing."},{"name":"November 2021 core update","start":"2021-11-17","end":"2021-11-30","dur":"13 days","incidentId":"FncPfR7zRSZ3diemah4o","desc":"A broad core ranking update that rolled out in late November over about two weeks. Moderate volatility observed across verticals, with some recovery for sites impacted by earlier 2021 core updates."},{"name":"November 2021 spam update","start":"2021-11-03","end":"2021-11-11","dur":"8 days","incidentId":"AFdXceQVsh1GEfKFvHyD","desc":"Targeted various spam techniques including link manipulation and thin auto-generated content. Part of Google's ongoing use of SpamBrain AI to detect and demote spammy sites."},{"name":"July 2021 link spam update","start":"2021-07-26","end":"2021-08-24","dur":"29 days","incidentId":"Gdx4pqurY2txYSQHD3Qp","desc":"Deployed improvements to SpamBrain to detect and neutralize link spam at scale, including purchased links and automated link-building. Both linking and linked-to sites could see ranking changes."},{"name":"July 2021 core update","start":"2021-07-01","end":"2021-07-12","dur":"11 days","incidentId":"m5jTNRjtTpWPjmkWDKP6","desc":"The second broad core update of 2021, released just weeks after the June core update finished. Google stated some planned June improvements were deferred to this release."},{"name":"June 2021 spam update (2)","start":"2021-06-28","end":"2021-06-29","dur":"< 1 day","incidentId":"hPHsygfNsCazcqZWPzBX","desc":"The second part of a two-part spam update targeting various webspam techniques. Released just days after the first June spam update."},{"name":"June 2021 spam update (1)","start":"2021-06-23","end":"2021-06-24","dur":"< 1 day","incidentId":"ksdhue6JuzLVA7ECzhKs","desc":"The first of a two-part spam update in June 2021, targeting sites violating Google's spam policies. Focused on new AI-based spam detection methods."},{"name":"Page experience update","start":"2021-06-15","end":null,"dur":null,"cat":"System","desc":"Introduced Core Web Vitals (LCP, FID, CLS) as ranking signals for mobile search results alongside existing page experience signals. Rolled out gradually from mid-June through August 2021."},{"name":"June 2021 core update","start":"2021-06-02","end":"2021-06-12","dur":"10 days","incidentId":"VHYebUFaMwLuCKC2ecD1","desc":"A broad core ranking update that launched alongside the page experience update rollout. Google noted some improvements planned for this update were deferred to the July 2021 core update."},{"name":"MUM Announced","start":"2021-05-18","end":null,"dur":null,"cat":"Core","ai":true,"desc":"Google announced Multitask Unified Model (MUM), a multimodal AI system 1,000 times more powerful than BERT that can understand and generate text across 75 languages. Designed to handle complex queries requiring synthesis of information from multiple sources and formats."},{"name":"April 2021 product reviews update","start":"2021-04-08","end":"2021-04-22","dur":"14 days","incidentId":"XpAy5zGc6VS78tDGbMaP","desc":"The first product reviews update, rewarding review content that demonstrated in-depth research and firsthand expertise rather than thin summaries of product specs. Affiliate and review sites with shallow content saw significant ranking declines."},{"name":"Passage Indexing","start":"2021-02-10","end":null,"dur":null,"cat":"System","desc":"Enabled Google to independently index and rank individual passages within a page, not just the page as a whole. Helped surface specific answers from long-form content that might otherwise be buried, affecting about 7% of queries."},{"name":"February 2021 Core Update","start":"2021-02-06","end":null,"dur":null,"cat":"Core","desc":"The first core update of 2021, bringing broad ranking changes across verticals. Moderate volatility observed, with particular movement in health, finance, and e-commerce niches."},{"name":"December 2020 Core Update","start":"2020-12-03","end":"2020-12-16","dur":"13 days","cat":"Core","desc":"A significant broad core update that caused substantial ranking volatility heading into the holiday season. Health, finance, real estate, and e-commerce sites saw notable shifts."},{"name":"May 2020 Core Update","start":"2020-05-04","end":null,"dur":null,"cat":"Core","desc":"One of the largest core updates in years, rolling out during the COVID-19 pandemic. YMYL sites - particularly health and medical content - saw dramatic ranking changes, leading many to call it a continuation of the Medic Update's direction."},{"name":"January 2020 Broad Core Update","start":"2020-03-12","end":null,"dur":null,"cat":"Core","desc":"A broad core ranking update that primarily impacted health, YMYL, and news verticals. Rolled out over several days in mid-January."},{"name":"Featured Snippet Update","start":"2020-01-23","end":null,"dur":null,"cat":"System","desc":"Changed how featured snippets interact with standard organic results by deduplicating - if a page appears in a featured snippet, it no longer also appears in the regular organic results on page one. Effectively reduced featured snippet holders from two listings to one."},{"name":"January 2020 Core Update","start":"2020-01-13","end":null,"dur":null,"cat":"Core","desc":"A broad core update in early January that brought moderate ranking fluctuations. Notable for being one of two confirmed core updates within the same month."},{"name":"November 2019 Local Search Update","start":"2019-12-02","end":null,"dur":null,"cat":"System","desc":"Applied neural matching technology to local search results, improving Google's ability to understand how queries relate to local businesses. Local pack and local finder results saw significant reshuffling."},{"name":"BERT","start":"2019-10-25","end":null,"dur":null,"cat":"Core","ai":true,"desc":"Introduced Bidirectional Encoder Representations from Transformers to better understand natural language and conversational queries, particularly prepositions and context words. Affected roughly 10% of English-language queries and was called one of the biggest leaps forward in search history."},{"name":"September 2019 Core Update","start":"2019-09-24","end":null,"dur":null,"cat":"Core","desc":"A broad core ranking update that rolled out over several days. Moderate impact observed across health, finance, and e-commerce sites."},{"name":"June 2019 Core Update","start":"2019-06-06","end":null,"dur":null,"cat":"Core","desc":"A broad core update that rolled out in early June. Many sites impacted by the March 2019 core update and the Medic Update saw partial recovery or further movement."},{"name":"De-Indexing Bug","start":"2019-04-05","end":null,"dur":null,"cat":"Other","desc":"A confirmed Google bug caused pages to temporarily drop out of the index entirely, affecting sites across all verticals. Google acknowledged the issue and stated it was not an algorithmic update but a technical error."},{"name":"March 2019 Core Update","start":"2019-03-12","end":null,"dur":null,"cat":"Core","desc":"A broad core ranking update nicknamed \"Florida 2\" by the SEO community due to its significant impact. YMYL and health sites continued to see major shuffling following the Medic Update's trajectory."},{"name":"Unconfirmed Update (Mar 2019)","start":"2019-03-01","end":null,"dur":null,"cat":"Other","desc":"SEOs observed significant ranking volatility in mid-March 2019 that was not officially confirmed by Google. Movement was reported across multiple verticals and tracking tools."},{"name":"Unconfirmed Update (Feb 2019)","start":"2019-02-06","end":null,"dur":null,"cat":"Other","desc":"Notable ranking fluctuations were detected by multiple tracking tools in February 2019. Google did not confirm any specific algorithm change during this period."},{"name":"Unconfirmed Update (Nov 2018)","start":"2018-11-29","end":null,"dur":null,"cat":"Other","desc":"SEOs observed significant ranking movement in late November 2018 that was not officially confirmed by Google. Multiple tracking tools detected elevated volatility across several verticals."},{"name":"Unconfirmed Update (Oct 2018)","start":"2018-10-15","end":null,"dur":null,"cat":"Other","desc":"Ranking fluctuations were widely reported by SEOs and tracking tools in October 2018. Google did not confirm an update, though the movement was substantial across YMYL niches."},{"name":"Unconfirmed Update (Sep 2018)","start":"2018-09-10","end":null,"dur":null,"cat":"Other","desc":"Notable ranking volatility was observed in late September 2018, potentially a continuation of the Medic Update's effects. Google did not confirm any specific algorithm change."},{"name":"Medic Update","start":"2018-08-01","end":null,"dur":null,"cat":"Core","desc":"A massive broad core update that disproportionately impacted health, medical, and YMYL (Your Money or Your Life) sites. Elevated the importance of E-A-T (Expertise, Authoritativeness, Trustworthiness) signals and reshaped how Google evaluates content quality in sensitive verticals."},{"name":"Unnamed Update (Apr 2018)","start":"2018-04-16","end":null,"dur":null,"cat":"Other","desc":"A confirmed but unnamed broad core update in April 2018, the first time Google proactively announced a core update. Google advised that there was no specific fix and recommended focusing on building great content."},{"name":"Unconfirmed Update (Mar 28 2018)","start":"2018-03-28","end":null,"dur":null,"cat":"Other","desc":"SEOs detected significant ranking volatility around March 28, 2018, distinct from the earlier March fluctuation. Google did not confirm any specific update."},{"name":"Unconfirmed Update (Mar 23 2018)","start":"2018-03-23","end":null,"dur":null,"cat":"Other","desc":"Ranking movement was reported by multiple tracking tools around March 23, 2018. The update was not confirmed by Google."},{"name":"Brackets Core Update","start":"2018-03-07","end":null,"dur":null,"cat":"Core","desc":"An unconfirmed but widely observed update in early March 2018, nicknamed \"Brackets\" due to its timing during March Madness. Significant ranking shuffling was reported across many verticals."},{"name":"Unconfirmed Update (Feb 2018)","start":"2018-02-20","end":null,"dur":null,"cat":"Other","desc":"Moderate ranking fluctuations were detected across tracking tools in February 2018. Google did not confirm any specific algorithm change."},{"name":"Maccabees","start":"2017-12-12","end":null,"dur":null,"cat":"Core","desc":"A broad update in mid-December 2017 that primarily impacted sites relying on keyword permutation landing pages and aggressive monetization. Google later confirmed it was a routine core ranking update."},{"name":"Fall Flux","start":"2017-09-08","end":null,"dur":null,"cat":"Other","desc":"A period of sustained ranking volatility through October and November 2017 that could not be attributed to a single update. SEOs speculated Google was testing multiple changes simultaneously."},{"name":"Transformers Paper","start":"2017-06-12","end":null,"dur":null,"cat":"Core","ai":true,"desc":"Google researchers published \"Attention Is All You Need,\" introducing the Transformer architecture that replaced recurrent neural networks with self-attention mechanisms. This paper became the foundation for virtually all modern large language models including BERT, GPT, and Gemini."},{"name":"Quality Update (Aug 2017)","start":"2017-08-19","end":null,"dur":null,"cat":"Other","desc":"An unconfirmed quality-focused update observed in August 2017 that affected content-heavy sites. Tracking tools showed elevated volatility particularly in health and lifestyle niches."},{"name":"Quality Update (Jul 2017)","start":"2017-07-09","end":null,"dur":null,"cat":"Other","desc":"An unconfirmed ranking shift in July 2017 that appeared to target content quality signals. SEOs reported movement similar to previous Phantom-style quality updates."},{"name":"Unnamed Update (Jun 2017)","start":"2017-06-25","end":null,"dur":null,"cat":"Other","desc":"Significant ranking volatility was observed in late June 2017 across multiple tracking tools. Google did not confirm any specific algorithm change."},{"name":"Quality Update (May 2017)","start":"2017-05-17","end":null,"dur":null,"cat":"Other","desc":"An unconfirmed quality update in May 2017 that appeared to further refine how Google evaluates content quality. Multiple tracking tools detected notable volatility."},{"name":"Fred","start":"2017-03-08","end":null,"dur":null,"cat":"Core","desc":"An unconfirmed but widely impactful update that targeted low-quality content sites built primarily for ad revenue rather than user value. Google's Gary Illyes jokingly named it \"Fred,\" and the name stuck within the SEO community."},{"name":"Unnamed Major Update (Feb 7 2017)","start":"2017-02-07","end":null,"dur":null,"cat":"Other","desc":"A significant ranking shift observed on February 7, 2017, just days after another major update. Appeared to target different sites and signals than the February 1 update."},{"name":"Japan Algorithm Update","start":"2017-02-03","end":null,"dur":null,"cat":"Other","desc":"A ranking update specific to Japanese-language search results targeting low-quality content. Reduced the visibility of curation and compilation sites with thin, unreliable content - particularly health-related WELQ-style sites."},{"name":"Unnamed Major Update (Feb 1 2017)","start":"2017-02-01","end":null,"dur":null,"cat":"Other","desc":"Major ranking volatility was detected across tracking tools on February 1, 2017. Impacted a wide range of verticals and was one of the most significant unconfirmed updates of early 2017."},{"name":"Intrusive Interstitial Penalty","start":"2017-01-10","end":null,"dur":null,"cat":"System","desc":"Penalized mobile pages that display intrusive interstitials (pop-ups) making content less accessible when users tap through from search results. Exemptions were made for legally required interstitials like cookie consent and age verification."},{"name":"Unnamed Major Update (Dec 2016)","start":"2016-12-14","end":null,"dur":null,"cat":"Other","desc":"Significant ranking movement was observed in late December 2016 across many verticals. Some SEOs connected it to quality-focused changes, but Google did not confirm an update."},{"name":"Unnamed Major Update (Nov 2016)","start":"2016-11-10","end":null,"dur":null,"cat":"Other","desc":"Major ranking volatility was detected across tracking tools in November 2016. Some sites hit by previous quality updates saw further movement."},{"name":"Penguin 4.0","start":"2016-09-27","end":"2016-10-06","dur":"9 days","cat":"Spam","desc":"A landmark update that made Penguin part of Google's core algorithm, running in real time instead of periodic refreshes. Shifted from penalizing sites with bad links to devaluing those links instead, and now operated at the page level rather than site-wide."},{"name":"Image/Universal Drop","start":"2016-09-13","end":null,"dur":null,"cat":"Other","desc":"SEOs observed a sharp drop in image results appearing in universal/blended search results. This affected sites that relied heavily on image search traffic for visibility."},{"name":"Unnamed Major Update (Sep 2016)","start":"2016-09-01","end":null,"dur":null,"cat":"Other","desc":"Significant ranking fluctuations were reported by multiple tracking tools in September 2016. Occurred shortly before the Penguin 4.0 launch, leading to speculation about pre-Penguin testing."},{"name":"Mobile-Friendly 2","start":"2016-05-12","end":null,"dur":null,"cat":"System","desc":"The second iteration of Google's mobile-friendly ranking boost, increasing the effect of the mobile-friendliness signal in mobile search results. Impact was less dramatic than the original Mobilegeddon update."},{"name":"Unnamed Major Update (May 2016)","start":"2016-05-10","end":null,"dur":null,"cat":"Other","desc":"Broad ranking volatility was observed in May 2016 across multiple verticals. Google did not confirm any specific algorithm change."},{"name":"Unnamed Update (Jan 2016)","start":"2016-01-08","end":null,"dur":null,"cat":"Other","desc":"SEOs detected ranking fluctuations in January 2016 that appeared to affect content quality signals. Google did not confirm any specific update."},{"name":"RankBrain","start":"2015-10-26","end":null,"dur":null,"cat":"Core","ai":true,"desc":"Introduced a machine learning-based component to Google's ranking algorithm that helps interpret ambiguous or novel queries. Google confirmed it was the third most important ranking signal at the time of its announcement."},{"name":"Quality Update","start":"2015-05-03","end":null,"dur":null,"cat":"Core","desc":"An unconfirmed but widely observed update in May 2015 - dubbed \"Phantom 2\" by some SEOs - that appeared to refine how Google assesses content quality at the page level. Content-heavy sites like HubPages and eHow saw significant traffic changes."},{"name":"Mobilegeddon","start":"2015-04-22","end":null,"dur":null,"cat":"System","desc":"Google's mobile-friendly ranking update began boosting mobile-friendly pages in mobile search results. Despite widespread panic, the initial impact was more gradual than expected, though it permanently changed how sites prioritized mobile responsiveness."},{"name":"Unnamed Update (Feb 2015)","start":"2015-02-04","end":null,"dur":null,"cat":"Other","desc":"Ranking fluctuations were observed in February 2015 across tracking tools. The update was not confirmed by Google but appeared to affect content quality signals."},{"name":"Pigeon Expands","start":"2014-12-22","end":null,"dur":null,"cat":"System","desc":"Extended the Pigeon local search update to the UK, Canada, and Australia after its initial US-only launch. Local directories and businesses in those markets saw ranking changes in local results."},{"name":"Penguin Everflux","start":"2014-12-10","end":null,"dur":null,"cat":"Spam","desc":"A period of continuous minor Penguin refreshes that Google described as a \"slow rollout\" rather than a single update. Sites affected by Penguin saw gradual ranking changes over weeks rather than a single shift."},{"name":"Pirate 2.0","start":"2014-10-21","end":null,"dur":null,"cat":"Spam","desc":"An update targeting sites that received large numbers of DMCA copyright removal requests. Significantly demoted piracy-focused sites like torrent directories and file-sharing portals in search results."},{"name":"Penguin 3.0","start":"2014-10-17","end":null,"dur":null,"cat":"Spam","desc":"A data refresh of the Penguin algorithm rather than a new version, allowing sites that had cleaned up spammy links to potentially recover. Affected roughly 1% of English queries and took weeks to fully roll out."},{"name":"Authorship Removed","start":"2014-08-28","end":null,"dur":null,"cat":"System","desc":"Google completely removed authorship markup and author photos from search results after gradually reducing their visibility. Ended the rel=\"author\" era that had connected content to Google+ profiles."},{"name":"HTTPS/SSL Update","start":"2014-08-06","end":null,"dur":null,"cat":"System","desc":"Google began using HTTPS as a lightweight ranking signal, giving a small boost to secure sites. Described as a \"very lightweight signal\" affecting fewer than 1% of global queries initially, but signaled Google's push toward a more secure web."},{"name":"Pigeon","start":"2014-07-24","end":null,"dur":null,"cat":"System","desc":"A major local search update that tied local results more closely to traditional web ranking signals and improved distance and location parameters. Local directories like Yelp saw significant visibility gains while some small businesses lost local pack presence."},{"name":"Authorship Photo Drop","start":"2014-06-28","end":null,"dur":null,"cat":"System","desc":"Google removed author photos from search results, keeping only the author byline text. This reduced click-through rates for many publishers who had benefited from the visual prominence of author photos."},{"name":"Payday Loan 3.0","start":"2014-06-12","end":null,"dur":null,"cat":"Spam","desc":"The third iteration targeting spammy queries in payday loans, gambling, and other highly spammed niches. Focused on catching sites that had evaded the first two Payday Loan updates."},{"name":"Payday Loan 2.0","start":"2014-05-16","end":null,"dur":null,"cat":"Spam","desc":"Targeted sites ranking for highly spammed queries like payday loans and gambling by penalizing manipulative link-building in those verticals. Complemented the first Payday Loan update by focusing on different spam signals."},{"name":"Unnamed Update (Mar 2014)","start":"2014-03-24","end":null,"dur":null,"cat":"Other","desc":"Moderate ranking fluctuations were observed across tracking tools in March 2014. The changes were not officially confirmed by Google."},{"name":"Page Layout #3","start":"2014-02-06","end":null,"dur":null,"cat":"System","desc":"The third iteration of the \"Top Heavy\" algorithm targeting pages with excessive ads above the fold. Continued penalizing pages where ads pushed main content below the visible area on page load."},{"name":"Authorship Shake-up","start":"2013-12-19","end":null,"dur":null,"cat":"System","desc":"Google significantly reduced the number of authorship rich snippets shown in search results by about 15%. Tightened the criteria for which authors and content qualified for author photo display."},{"name":"Unnamed Update (Dec 2013)","start":"2013-12-17","end":null,"dur":null,"cat":"Other","desc":"Ranking fluctuations were observed by tracking tools in December 2013. Google did not confirm any specific algorithm change during this period."},{"name":"Unnamed Update (Nov 2013)","start":"2013-11-14","end":null,"dur":null,"cat":"Other","desc":"Moderate ranking volatility was reported by SEOs in November 2013. The update was not confirmed by Google."},{"name":"Penguin 2.1","start":"2013-10-04","end":null,"dur":null,"cat":"Spam","desc":"A data refresh of the Penguin 2.0 algorithm targeting webspam and manipulative link practices. Affected approximately 1% of search queries."},{"name":"Hummingbird","start":"2013-08-20","end":null,"dur":null,"cat":"Core","ai":true,"desc":"A complete rewrite of Google's core search algorithm - the most significant overhaul since 2001 - designed to better understand conversational and natural language queries. Improved Google's ability to understand query intent and the meaning behind words rather than matching individual keywords."},{"name":"In-depth Articles","start":"2013-08-06","end":null,"dur":null,"cat":"System","desc":"Google introduced an \"In-depth articles\" block in search results showcasing long-form, high-quality content from authoritative publishers. Featured articles from major publications with schema markup and authorship data."},{"name":"Unnamed Update (Jul 2013)","start":"2013-07-26","end":null,"dur":null,"cat":"Other","desc":"Ranking movement was observed by tracking tools in July 2013. The changes were not officially attributed to any specific algorithm update."},{"name":"Knowledge Graph Expansion","start":"2013-07-19","end":null,"dur":null,"cat":"System","desc":"Google expanded the Knowledge Graph to include answers to more complex questions and comparisons. Enhanced the display of direct answers and entity information in search results."},{"name":"Multi-Week Update","start":"2013-06-27","end":null,"dur":null,"cat":"Other","desc":"A prolonged period of ranking changes in March/April 2013 that SEOs attributed to multiple overlapping algorithm updates. Google did not confirm a single named update but acknowledged ongoing improvements."},{"name":"Payday Loan Update","start":"2013-06-11","end":null,"dur":null,"cat":"Spam","desc":"The first update specifically targeting highly spammed queries related to payday loans, casinos, and other shady verticals. Affected approximately 0.3% of English queries by demoting spammy sites ranking for these terms."},{"name":"Penguin 2.0","start":"2013-05-22","end":null,"dur":null,"cat":"Spam","desc":"A deeper, more aggressive version of the original Penguin update that went beyond homepage-level analysis to evaluate links at the page level. Google's Matt Cutts had previewed this as a major webspam update affecting approximately 2.3% of English queries."},{"name":"Domain Crowding","start":"2013-05-21","end":null,"dur":null,"cat":"System","desc":"Google reduced the number of results from the same domain that could appear on a single search results page. Improved result diversity by limiting domain clustering."},{"name":"Phantom","start":"2013-05-09","end":null,"dur":null,"cat":"Core","desc":"An unconfirmed but widely observed quality update in May 2013 that appeared to target content quality at the page level. Many content-farm-style sites and sites with thin or ad-heavy pages saw significant ranking declines."},{"name":"Knowledge Graph Expansion (Dec 2012)","start":"2012-12-04","end":null,"dur":null,"cat":"System","desc":"Google expanded Knowledge Graph coverage with a batch of 65 improvements including enhanced entity information and richer direct answers. Part of Google's ongoing monthly batched changes."},{"name":"Page Layout #2","start":"2012-10-09","end":null,"dur":null,"cat":"System","desc":"The second iteration of the algorithm targeting pages with too many ads above the fold, penalizing sites where main content was pushed below the visible area. Updated the signals and thresholds from the original \"Top Heavy\" update."},{"name":"Penguin #3","start":"2012-10-05","end":null,"dur":null,"cat":"Spam","desc":"A data refresh of the Penguin algorithm that affected approximately 0.3% of English queries. Allowed some sites that had cleaned up manipulative links to recover rankings."},{"name":"August/September 65-Pack","start":"2012-10-04","end":null,"dur":null,"cat":"Other","desc":"A batch of 65 search quality improvements disclosed on the Google blog covering August and September changes. Included updates to freshness signals, spelling correction, and snippet generation."},{"name":"Exact-Match Domain Update","start":"2012-09-27","end":null,"dur":null,"cat":"System","desc":"Targeted low-quality sites that relied on exact-match domains (like best-cheap-hotels.com) to rank for their target keywords. Reduced the ranking advantage of keyword-rich domain names for sites with thin or poor content."},{"name":"June/July 86-Pack","start":"2012-08-10","end":null,"dur":null,"cat":"Other","desc":"A batch of 86 search quality improvements disclosed on the Google blog covering June and July. Included changes to Panda, Knowledge Graph, and local search among many others."},{"name":"May 39-Pack","start":"2012-06-07","end":null,"dur":null,"cat":"Other","desc":"A batch of 39 search improvements disclosed on the Google blog for May 2012. Included Penguin-related refinements, image search improvements, and snippet quality changes."},{"name":"Penguin 1.1","start":"2012-05-25","end":null,"dur":null,"cat":"Spam","desc":"A minor data refresh of the original Penguin algorithm targeting webspam and manipulative link practices. Affected less than 0.1% of English search queries."},{"name":"Knowledge Graph","start":"2012-05-16","end":null,"dur":null,"cat":"System","desc":"Google launched the Knowledge Graph, displaying structured information panels alongside search results for entities like people, places, and things. Drew from sources like Freebase, Wikipedia, and the CIA World Factbook to understand real-world entities and their relationships."},{"name":"April 52-Pack","start":"2012-05-04","end":null,"dur":null,"cat":"Other","desc":"A batch of 52 search improvements disclosed on the Google blog for April 2012. Included changes to link evaluation, freshness, SafeSearch, and page quality assessment."},{"name":"Penguin","start":"2012-04-24","end":null,"dur":null,"cat":"Spam","desc":"A major algorithm update targeting webspam - specifically link schemes, keyword stuffing, and manipulative link-building tactics. Affected approximately 3.1% of English queries and fundamentally changed how SEOs approached link building."},{"name":"Parked Domain Bug","start":"2012-04-16","end":null,"dur":null,"cat":"Other","desc":"A bug caused parked domains (placeholder pages with ads) to appear more frequently in search results. Google acknowledged and fixed the issue after SEOs reported increased parked domain visibility."},{"name":"March 50-Pack","start":"2012-04-03","end":null,"dur":null,"cat":"Other","desc":"A batch of 50 search improvements disclosed on the Google blog for March 2012. Included changes to freshness, snippet generation, and spam detection."},{"name":"Venice","start":"2012-02-27","end":null,"dur":null,"cat":"System","desc":"Improved local search results by more heavily factoring the searcher's geographic location into results for queries with local intent. Made local results more prominent even for queries that did not explicitly include a city or region name."},{"name":"February 40-Pack","start":"2012-02-27","end":null,"dur":null,"cat":"Other","desc":"A batch of 40 search improvements disclosed on the Google blog for February 2012. Included changes to image search, spell-checking, and freshness signals."},{"name":"February 17-Pack","start":"2012-02-03","end":null,"dur":null,"cat":"Other","desc":"A batch of 17 search improvements disclosed on the Google blog for early February 2012. Included refinements to autocomplete, snippet quality, and SafeSearch."},{"name":"Ads Above The Fold","start":"2012-01-19","end":null,"dur":null,"cat":"System","desc":"Also called \"Top Heavy,\" this update penalized pages with excessive advertising above the fold that pushed main content below the visible area. Targeted sites where users had to scroll past large ad blocks to reach actual content."},{"name":"January 30-Pack","start":"2012-01-05","end":null,"dur":null,"cat":"Other","desc":"A batch of 30 search improvements disclosed on the Google blog for January 2012. This was the first of Google's monthly \"search quality highlight\" posts detailing batched algorithm changes."},{"name":"December 10-Pack","start":"2011-12-01","end":null,"dur":null,"cat":"Other","desc":"A batch of 10 search quality improvements disclosed on the Google blog for late December 2011. Included refinements to spell-checking, freshness signals, and image search."},{"name":"10-Pack of Updates","start":"2011-11-14","end":null,"dur":null,"cat":"Other","desc":"A batch of 10 search improvements disclosed by Google in November 2011. Included changes to site links, freshness, and snippet generation."},{"name":"Freshness Update","start":"2011-11-03","end":null,"dur":null,"cat":"Core","desc":"Updated approximately 35% of search results to favor more recent content for queries where freshness matters - such as recent events, recurring events, and frequently updated topics. One of the largest ranking changes Google had announced at that time."},{"name":"516 Algo Updates","start":"2011-09-21","end":null,"dur":null,"cat":"Other","desc":"Google disclosed that it had made 516 algorithm changes throughout 2010 in a rare look at the volume of search changes. Highlighted how frequently Google modifies its ranking systems beyond the major named updates."},{"name":"Attribution Update","start":"2011-01-28","end":null,"dur":null,"cat":"Other","desc":"Targeted content scrapers and sites that copied content from original sources without adding value. Aimed to ensure original content creators ranked above sites that simply aggregated or repurposed their work."},{"name":"Overstock.com Penalty","start":"2011-01-15","end":null,"dur":null,"cat":"Spam","desc":"Google penalized Overstock.com for offering discounts to universities in exchange for .edu links pointing to commercial pages. A high-profile example of Google taking manual action against a major brand for manipulative link schemes."},{"name":"Social Signals","start":"2010-12-15","end":null,"dur":null,"cat":"System","desc":"Google and Bing both confirmed they were using social signals - including shared links on Twitter and Facebook - as ranking factors. Marked the beginning of social media's direct influence on search rankings."},{"name":"Negative Reviews","start":"2010-12-15","end":null,"dur":null,"cat":"System","desc":"Google modified its algorithm after a New York Times expose on DecorMyEyes, a retailer that deliberately generated negative reviews to gain link-based visibility. Ensured that businesses could not benefit in rankings from negative sentiment and press coverage."},{"name":"Brand Update","start":"2010-08-15","end":null,"dur":null,"cat":"System","desc":"Also called \"Vince\" by some, this update gave an increased ranking advantage to large, established brands for broad, competitive head terms. Smaller sites found it harder to compete for generic high-volume keywords."},{"name":"Caffeine","start":"2010-06-15","end":null,"dur":null,"cat":"Core","desc":"A complete rebuild of Google's web indexing infrastructure that dramatically improved crawling speed and index freshness. Delivered 50% fresher results by enabling near-real-time indexing of new content across the web."},{"name":"May Day","start":"2010-05-15","end":null,"dur":null,"cat":"Core","desc":"Targeted long-tail search queries by reducing rankings for thin or low-quality pages that had previously ranked well for very specific, multi-word searches. E-commerce sites with large numbers of thin product pages were particularly affected."},{"name":"Vince","start":"2009-02-15","end":null,"dur":null,"cat":"Core","desc":"A ranking change that appeared to favor big brands for broad, competitive search queries. Google's Matt Cutts described it as a minor change, but SEOs observed major brands gaining significant visibility for head terms."},{"name":"Dewey","start":"2008-04-15","end":null,"dur":null,"cat":"Other","desc":"A major but poorly documented ranking shift in April 2008 that caused significant volatility across many verticals. Google did not officially confirm the update, and its specific targeting remained unclear."},{"name":"Buffy","start":"2007-06-15","end":null,"dur":null,"cat":"Other","desc":"A minor update in June 2007 that Google's Matt Cutts described as a series of small changes rather than a single major update. Named by SEOs and generally considered to have had modest impact."},{"name":"Universal Search","start":"2007-05-15","end":null,"dur":null,"cat":"System","desc":"Google began blending results from multiple vertical search engines - images, video, news, maps, and books - directly into the main search results page. Fundamentally changed the SERP layout from ten blue links to a mixed-media experience."},{"name":"False Alarm","start":"2006-12-15","end":null,"dur":null,"cat":"Other","desc":"SEOs detected significant ranking movement in September 2006 and labeled it a major update, but Google indicated no significant algorithm change had occurred. Demonstrated how normal index refreshes and fluctuations could be mistaken for updates."},{"name":"Supplemental Update","start":"2006-11-15","end":null,"dur":null,"cat":"System","desc":"Google modified how pages were classified in its supplemental index versus main index, affecting which pages were served for queries. Pages in the supplemental index were considered lower quality and less likely to appear in results."},{"name":"Big Daddy","start":"2005-12-15","end":null,"dur":null,"cat":"Core","desc":"A major infrastructure update that changed how Google handled URL canonicalization, redirects, and duplicate content. Rolled out over several months across Google's data centers and affected how sites with complex URL structures were crawled and indexed."},{"name":"Jagger","start":"2005-10-15","end":null,"dur":null,"cat":"Core","desc":"A multi-phase update targeting manipulative link practices including reciprocal link schemes, link farms, and paid links. Rolled out across October and November 2005 and was one of the most significant anti-link-spam updates of its era."},{"name":"Gilligan","start":"2005-09-15","end":null,"dur":null,"cat":"Other","desc":"A minor or possibly non-existent update that some SEOs believed they detected in late 2005. Never confirmed by Google and may have been normal ranking fluctuation."},{"name":"Personalized Search","start":"2005-06-15","end":null,"dur":null,"cat":"System","desc":"Google expanded personalized search results to all users based on their search history, not just those signed into Google accounts. Marked the beginning of individually tailored search results becoming the default experience."},{"name":"Bourbon","start":"2005-05-15","end":null,"dur":null,"cat":"Core","desc":"Affected how Google handled duplicate content, non-www versus www canonicalization, and PageRank calculation. Also appeared to change how Google treated sites hosted on the same IP address."},{"name":"Allegra","start":"2005-02-15","end":null,"dur":null,"cat":"Core","desc":"A February 2005 update that appeared to target suspicious linking patterns and sites with low-quality inbound links. Also seemed to affect how Google valued links from topically related versus unrelated sites."},{"name":"Brandy","start":"2004-02-15","end":null,"dur":null,"cat":"Core","desc":"Brought a massive expansion of Google's index along with improvements to Latent Semantic Indexing (LSI) for better understanding of content relevance. Also expanded the concept of \"link neighborhoods\" - evaluating the quality of sites linking to and from a page."},{"name":"Austin","start":"2004-01-15","end":null,"dur":null,"cat":"Core","desc":"Continued the work of the Florida update by further targeting manipulative SEO techniques like invisible text, meta-tag stuffing, and doorway pages. Many sites that had escaped Florida's impact were caught by Austin."},{"name":"Florida","start":"2003-11-15","end":null,"dur":null,"cat":"Core","desc":"The most infamous early Google update, launched in November 2003, that devastated many commercial sites relying on keyword stuffing and manipulative SEO tactics. Introduced commercial intent filters and fundamentally changed the SEO industry overnight, putting many aggressive optimizers out of business."},{"name":"Supplemental Index","start":"2003-09-15","end":null,"dur":null,"cat":"System","desc":"Google introduced a visible \"supplemental index\" label on search results for pages it considered lower quality or less important. Pages marked as supplemental were crawled less frequently and ranked lower."},{"name":"Fritz","start":"2003-07-15","end":null,"dur":null,"cat":"Core","desc":"Ended Google's monthly \"Google Dance\" by shifting to a continuous index update model. Previously, major index refreshes happened monthly, causing dramatic monthly ranking shifts - Fritz made updates incremental and ongoing."},{"name":"Esmeralda","start":"2003-06-15","end":null,"dur":null,"cat":"Core","desc":"The last of the major monthly \"Google Dance\" updates before Google moved to continuous index updates with Fritz. Brought the usual monthly reshuffling of rankings across the index."},{"name":"Dominic","start":"2003-05-15","end":null,"dur":null,"cat":"Core","desc":"A monthly Google Dance update in May 2003 that brought the typical index-wide ranking recalculation. Also introduced changes to how Google tracked and reported backlinks in its toolbar."},{"name":"Cassandra","start":"2003-04-15","end":null,"dur":null,"cat":"Core","desc":"Targeted manipulative link practices including excessive linking between co-owned domains and hidden links. One of the early updates to crack down on link manipulation tactics."},{"name":"Boston","start":"2003-02-15","end":null,"dur":null,"cat":"Core","desc":"The first named Google algorithm update, announced at SES Boston in February 2003, establishing the tradition of naming major updates. Brought monthly index refreshes and significant ranking changes across the web."},{"name":"1st Documented Update","start":"2002-09-15","end":null,"dur":null,"cat":"Other","desc":"The earliest widely documented Google ranking update, observed in September 2002. SEOs noticed significant ranking changes that marked the beginning of the community actively tracking and naming Google algorithm shifts."}]
}